Learning curve for Z7/Z6

My experience is there are three factors contributing to cold weather performance.

The Z6/7 has better weather sealing than most alternatives and that help keep the cold out. But with the large mount, watch out when you change lenses.

The biggest point of failure is the electronics rather than mechanicals. In colder weather, the electronics can lack voltage to perform so you lose displays and overlays. But the displays of the Z cameras are more robust than the overlays through the OVF of DSLRs. My guess is the Z cameras are a little better.

The last area is camera extremities. The Z camera is relatively compact and combines all the electronics in a more compact space. It may have more issues with heat dispersion for astrophotography but I have not heard anything specific. The issue with long exposures and time lapse is hot pixels, and cold reduces hot pixel noise.

I’d take the Z and find out how it performs. Using a bag with heat packs is a great idea.